CAR WAS BACKED OUT OF GARAGE. WHILE IN REVERSE, THE ENGINE BEGAN RACING WIDE OPEN, WENT ACROSS 2 DRIVEWAYS AND HIT ANOTHER VEHICLE. BRAKES WOULD NOT STOP IT AND WOULD NOT GO OUT OF REVERSE. THE ONLY WAY TO STOP IT WAS IMPACT AND TURNING THE IGNITION OFF. THIS ALL TOOK PLACE IN ABOUT 3 SECONDS.*AK